I am supporting a tripod via 3 pieces of square tubing (one for each
foot). The support tubes are to be 2" x 11GA (1.20") hot rolled mild
carbon steel.  Each tube will be welded at each end to span members of
a larger cart frame of rectangular tubing (2" 1/2 x 1 1/2" x 14GA). 
The tubes will have a 1 1/2" hole cut into the top 3" from one end in
which the tripod feet will nest.  The feet rest on the top surface of
the tube.  Assuming these support tubes (along with its welds to 14GA
tubing) are the weakest link in the system, how much static load, in
pounds, can the tripod carry before
failure?

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Request for Question Clarification by redhoss-ga on 15 Jun 2006 18:16 PDT

I have read your question over several times. I know that it is
perfectly clear to you, but I can't understand what you are
describing. I could possibly help you if I could draw myself a sketch,
but I can't. I don't even know what questions to ask. Is there a
picture of something similar that you could direct me to.